[Python-Dev] Dictionary evaluation order (original) (raw)

Gustavo Niemeyer niemeyer@conectiva.com
Tue, 26 Nov 2002 14:09:02 -0200

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Note that the primary point of the referenced bug report

<http://www.python.org/sf/448679> Left to right is that the Ref Man doesn't really address Python's evaluation order.

Yes, I'm aware about that. I'd just like to fix that, or to document the exception, together with the evaluation order documentation.

Guido has said he intended left-to-right, in which case the dict example would be an endcase glitch. I don't believe the language definition currently requires or forbids any specific eval order here, though.

Ok. I can take the following conclusions then. Please, correct me if I'm wrong.

• everyone seems to agree that the current behavior is not set in stone;
• no one should expect the current behavior, as it is not documented, and not good to expect such language behavior anyway;
• having the L2R order where possible would be good and was originaly intended;
• Jython already uses L2R in that case as well;

Based on that, I'll write a suggested solution including documentation, and post for review.

Thanks everyone.

-- Gustavo Niemeyer

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